Iieinrich hempel



- (No Model.)

Winer Z/Z 15w.

Patented Mar. 3, 1896.

UNITED p STATES PATENT OFFICE.

HEINRICH HEMPEL, OF BERLIN, GERMANY.

TELEPHONE-CALL REGISTER.

SPECIFICATION forming part of Letters Patent No. 555,645, dated March 3,1896. Application filed April 9, 1895. Serial No. 545,070. (No model.)

To all whom it may concern.-

Be it known that I, HEINRICH HEMPEL, a resident of Berlin, in theKingdom of Prussia, German Empire, have invented certain new and usefulImprovements in Apparatus for Indicating or Recording TelephonicConnections, of which the following is declared to be a full, clear, andexact description. 7

The object of the present invention is to provide an arrangement bymeans of which control or indication of use of the telephone bysubscribers is obtained so far as the subscriber is concerned, while theuse of it on the part of the summoned subscriber is not controlled. Bythis means the telephone management receives indication of the amount ofconversation led to by the summoning subscriber.

In Figure 1 of the drawings the apparatus is represented in front viewin position on a telephone with ringing-crank. Fig. 2 shows the internalviewof the telephone seen from behind, and Fig. 3 is a detail view.

On the front wall 4) of the telephone and near the ringing-crank isthere is fitted a counting mechanism ,2, the one illustrated consistingof four dials, which specify units, tens, hundreds, and thousands andallows of reckoning up to ten thousand; but any other indicatingcontrivance may be used. A bar 1 is furnished with a pointed head whichenters notches e in a star-wheel w. This starwheel w is fixed on theringing-crank axle q. A pin a on the bar r enters through a slot in thewall 0 to the interior of the telephone and works a forked lever-arm h,which is pivoted at 'L' on the inside of the wall 0). This leverarmcarries a pin 8. The lever-arm m of the hook f is shown in Fig. 2 incontact with the telephone-line-circuit terminal, which occurs when thereceiver is lifted from the movable hook f; but in its normal positionthe leverarm m is in contact with the bell-circuit terminal.

In order to be able to turn the crank for the purpose of callingattention after taking down the receiver the summoning subscriber isfirst of all obliged to pull down the bolt 0", the finger-piece 0 beingprovided for this purpose, whereupon the pointed head 19 of the bolt 0*comes out of the notch e of the starwheel w. At the same time a pin 3 onthe bar r acts on a fork g in connection with the indicating mechanismand the pin 8' on the lever h is drawn into contact with the leverarm m.The crank can now be turned as often as is necessary in order, first ofall, to call the exchange and then the desired subscriber.

After finishing a conversation with a subscriber thedisconnection-signal is given by a further turning of the crank it, andthereafter the receiver is again hung upon its hook f, through theweight of which the lever-arm m is brought into contact with the pin 0.On the rising of the lever-arm m the pin 8 is moved upward, and with itthe lever h, and as the latter is in connection with the pin a the bolt7' is pushed into its highest position, as indicated at Fig. 1. Turningof the crank It is thereafter prevented until the bolt 1' is againpressed into its lowest position. On the rising of the bolt 7' the forkg is moved upward by the pin 8 and there is occasioned by this movementa unit movement of the counting mechanism a. The counting mechanism canalso be so arranged that the indication takes place on pushing down thebolt and on the upward movement of the latter no movement of thecounting mechanism occurs.

As the indication on the dial of the countin g mechanism only follows onthe movement of the bolt 7", and as the subscriber summoned does notrequire to turn the crank and so has no need to move the bolt 1, theconversation is only registered on the telephone of the summoningsubscriber.

-The spring-tension of the counting mechanism is so adjusted that theweight of the receiver when hung upon its hook f presses down themovable hook and at the same time carries upward the bolt 1", whereuponthe pin 8 on it acts on the fork g of the counting mechanism to efiectthe registration of connection.

In order to call attention the bolt 'r must be moved, and in order afterfinishing a conversation to oifer the possibility of being called thereceiver must be hung into the movable hook f, by whose weight the bolt7' is pressed up into its normal position. In this way a sure indicationof the use of the telephone is provided.

The arrangement represented in Fig. 1 may be surrounded by a case, outof which pro ject only the ringing-crank, the call-key and the lowerpart of the bolt 4'. The dial of the indicator may be covered with glassand be left visible.

Having thus described the invention, What I claim as new, and desire tosecure by Letters Patent, is-

A conversationindicator for telephones, characterized by a bolt thepointed head of which in its highest position engages with a star-Wheelsecured on the ringing-crank axle, and the pin on the belt of which isso connectcd with counting mechanism that either the upward or downwardmovement of the bolt 0' effects a unit movement of the countingmechanism in such a Way as to indicate the number of connections madefor the purpose of conversation, while a pin likewise fastened onto thebolt is so connected with a lever-arm and pin that on pressing down thebolt the pin rests upon the second lever-arm and on the upward movementof this leverarm induced by the hanging of the receiver, the otherlever'arm and with it the bolt is pressed up, and by this means thefurther turning of the crank is prevented substantially as described.

HEINRICH HEMPEL. \Vitnesses:

WM. HAUPT, CHAS. KRi'JGER.

